模板法合成三维菊花状TiO₂纳米花及其性能

李宣东¹, 付丽¹, 刘惠玲², 王炎³, 文爱花¹, 刘臣娟¹

(1.哈尔滨工业大学 理学院, 150001 哈尔滨; 2.哈尔滨工业大学 市政环境工程学院, 150090 哈尔滨; 3.哈尔滨工业大学 基础与交叉科学研究院,150010 哈尔滨)



摘要:

为了解决一维、二维纳米材料在降解有机污染物时,易发生团聚、催化活性低、难以回收利用等问题,以TiO₂(P25)和NaOH为原料,ZnO为模板,采用水热法合成了三维菊花状TiO₂纳米花．运用扫描电子显微镜、X射线衍射仪、氮气吸附脱附、紫外-可见漫反射、傅立叶红外等手段对合成的样品进行测试分析. 结果表明:其花瓣是由TiO₂纳米颗粒通过自组装定向排列而成的链状结构,构成纳米花的粒子晶粒尺寸约15 nm,花状结构尺寸约为5 μm,结晶性良好,为锐钛矿相;比表面积为102.3 m²／g,平均孔径为17.41 nm;以亚甲基蓝为目标污染物,在紫外光照射下对其进行光催化性能实验,80 min亚甲基蓝的降解率为98％,催化活性高于P25,显示出较强的光催化活性．

关键词:  TiO₂  纳米花  水热  模板法  自组装

DOI：10.11918/j.issn.0367-6234.2014.02.011

分类号:

基金项目:国家自然科学基金资助项目(8,5)．



Template synthesis and the properties of three-dimensional chrysanthemum-like TiO₂ nanoflowers

LI Xuandong¹, FU Li¹, LIU Huiling², WANG Yan³, WEN Aihua¹, LIU Chenjuan¹

(1.College of Science, Harbin Institute of Technology, 150001 Harbin, China; 2.School of Municipal Environmental Engineering, Harbin Institute of Technology,150090 Harbin, China; 3.Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, 150010 Harbin, China)

Abstract:

To solve the problem of agglomeration, low catalytic activity and difficulty to recycle and utilize of the 1-D, 2-D nanomaterials during the process of degradating organic pollutants.3-D TiO₂ nanoflowers with chrysanthemum structure were prepared by template hydrothermal method in which TiO₂(P25)and NaOH as raw materials, with assistance of ZnO nanostructure templates. Petals in nanoflowers were self-assembled and arranged directionally by TiO₂ nanoparticles.The TiO₂ nanoflowers was characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), nitrogen adsorption-desorption, ultraviolet-visibles diffuse reflectance sepctroscopy (UV-vis DRS), Fourier transform infrared (FTIR). The SEM images indicated that TiO₂ nanoflowers were chrysanthemum shape and average particle size was 5 μm. Self-assembled nanoflower of the diameter of the nanoparticles was about 15 nm. It was confirmed by XRD that the TiO₂ nanoflowers was pure anatase crystalline structure with good crystallinity. The N₂ adsorption-stripping isotherm results showed that specific surface area was 102.3 m²／g and average pore size is about 17.41 nm. Methylene blue as the target pollutant, the photocatalytic degradation of methylene blue rate in 80 minutes could reach 98％ under UV irradiation. So photocatalytic activity of TiO₂ nanoflowers was higher than P25, and showing stronger photocatalytic degradation ability.

Key words:  TiO2  nanoflowers  hydrothermal  template  self-assembled